Fixes

• Revert "json: remove deprecated old style path+data request format"
• Add sync_height_threshold to config (#7805)
• Move the check for is_height_processed forward before process_block_header (#7831)

CODE_COLOR: CODE_YELLOW_TESTNET
RELEASE_VERSION: 1.30.0-rc.4
PROTOCOL_UPGRADE: FALSE
DATABASE_UPGRADE: FALSE
SECURITY_UPGRADE: FALSE